I realize there are near-duplicate questions, but none with answers that apply to my specific question, for SharePoint Online. Specifically: how can I as a site owner determine what groups are associated with the site, and more critically, the membership of each group? Several sources I have found, including on this site, say that one must use either some form of scripting (ASP or JS), or PowerShell from the Windows command line. This strikes me as odd and at least worth clarifying: is there a GUI method to get/edit group membership?
To expand, Microsoft's own documentation says to edit groups by using the Share button ... which doesn't exist for my team site, in my current environment. (I'm a site owner, but not a system-wide administrator or AD administrator.) I can add groups via the Site Permissions, but never delete or edit one? Again, this seems like an implausible design choice for Microsoft. Can I link a SharePoint "List" view to a group and work that way?